Two users must encrypt and transmit large amounts of data between them. Which of the following should they use to encrypt and transmit the data?

Symmetric algorithms (e.g., AES) use a single shared key for both encryption and decryption, making them extremely fast and efficient for bulk data encryption. They are specifically designed for encrypting large amounts of data at high speeds, making them the standard choice for securing data in transit when both parties can securely share a key.

Hash functions are one-way mathematical operations that produce a fixed-length digest and cannot be reversed or used to decrypt data, making them unsuitable for encrypting and transmitting data.

Digital signatures use asymmetric cryptography to verify the authenticity and integrity of data but do not encrypt the actual content of a message for confidentiality.

Obfuscation simply makes data harder to read or understand (e.g., encoding or renaming variables) but does not provide true cryptographic security or protect data during transmission.